[consensus] Restore marshal ancestor stream symmetry

[clabby]

Overview

Restores symmetry between the coding and standard marshal mailboxes, where the BlockProvider implementation was lost on the coding variant in 16e6e61.

Also requires Unpin on the Stream passed through the Application interface's functions, to remove the need for users to manually pin the stream.

Also requires 'static on the same Stream to allow for the ErasedBlockProvider in #3764

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	commonware-mcp	49f4380	May 20 2026, 04:00 PM

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[github-actions]

Benchmark results

Tip

✅ PASSED: No benchmark exceeded the regression threshold.

Benchmark comparison table

Benchmark	Baseline (main)	Current	Delta	Threshold	Status
qmdb::merkleize/variant=any::unordered::fixed::mmr keys=10000 ch=false sync=false	1.567 ms	1.717 ms	+9.57%	10.00%	✅ PASS
qmdb::merkleize/variant=current::ordered::fixed::mmb chunk=256 keys=10000 ch=true sync=false	3.100 ms	3.128 ms	+0.89%	10.00%	✅ PASS

Baseline commit(s): 14a016a55f43

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[codecov]

Codecov Report

❌ Patch coverage is 98.23009% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.74%. Comparing base (cb94eeb) to head (49f4380).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
consensus/src/marshal/coding/mod.rs	97.29%	1 Missing ⚠️
consensus/src/marshal/mocks/verifying.rs	75.00%	1 Missing ⚠️

@@           Coverage Diff            @@
##             main    #3835    +/-   ##
========================================
  Coverage   95.73%   95.74%            
========================================
  Files         473      473            
  Lines      192406   192555   +149     
  Branches     4665     4666     +1     
========================================
+ Hits       184204   184360   +156     
+ Misses       6631     6626     -5     
+ Partials     1571     1569     -2     

Files with missing lines	Coverage Δ
consensus/src/lib.rs	0.00% <ø> (ø)
consensus/src/marshal/ancestry.rs	94.59% <100.00%> (-0.28%)	⬇️
consensus/src/marshal/coding/variant.rs	95.08% <100.00%> (+1.33%)	⬆️
consensus/src/marshal/core/mailbox.rs	92.91% <100.00%> (+0.52%)	⬆️
consensus/src/marshal/mocks/harness.rs	98.75% <100.00%> (+<0.01%)	⬆️
consensus/src/marshal/standard/mod.rs	96.80% <100.00%> (+0.03%)	⬆️
consensus/src/marshal/standard/variant.rs	100.00% <100.00%> (ø)
consensus/src/marshal/coding/mod.rs	96.15% <97.29%> (+0.19%)	⬆️
consensus/src/marshal/mocks/verifying.rs	89.61% <75.00%> (ø)

... and 7 files with indirect coverage changes

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